Hans realf ottesen



' No. 626,7!7. Patented June I3, I899.

H. B. OTTESEN. ELECTRIC Anc LAMP.

(Application filed Jan. 5, 1899.\

(No Model.)

A TTORNEYS I UNITED STATES PATENT OFFICE.

HANS REALF OTTESEN, OF HANOVER, GERMANY.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 626,717, dated June 13, 1899.

Application filed January 5,1899. Serial No. 701,253. (No model.)

which they are suspended, form a voltaic are.

which remains of constant length and always occupiesthe same position quite independently of the combustion of the carbons. In the invention an insulating-plate is introduced between the ends of the carbons, giving an intense illuminating effect when raised to white heat.

Referring to the drawings which form a part of this.specificatiomFigure 1 shows the math.-

ematical principle on which theinvention is based. Fig. 2 represents the improved arclamp in front elevation, and Fig. 3 represents the same in side elevation, and Fig. 4E represents a part in detail.

\Vith points A, B, and C, Fig. 1, as centers three segments of circles whose radii are re spectively 'r, r, and r are drawn intersecting each other at the point F, so that from every straight line drawn from the point F equal lengths p are cut off between the two circles whose centers are A and B on one side and those whose centers are A and O on the otherthus, for instance, D E=D E zD E and so on. If now the radii r and r represent rods pivoted at A, B,fand O and connected by pivots at their outer extremities to a third, as will be hereinafter more fully described, equal to p in length, then whatever may be the position occupied by rand 'r 13 will always occupy such a position that its elonga: tion passes through F. This fact has been utilized by me in my improved arc-lamp.

The two carbons a a, Fig. 2, are not arranged vertically one over the other, but are both slightly inclined relatively to the horizon, so as to form an obtuse angle with one another. They are secured in the carbonholders 0 0 (shown in detail in Fig. 4;) by means of screws 7) b. Rods f and g are pivoted to the carbon holders by the pins cl and e and are adapted to turn on the pivots h and i, suitably fixed in the face-plates k k. The distance between the centers of the joints cl and 6 corresponds with the constant length 19 in Fig. 1. rods g are provided with lateral arms Z, on which weights or can be placed. The arms f and g are of insulating material or are insulated byinsulating-pieces from the holders.

Between the two carbon rods, which are pressed toward each other by the weights m and which always meet in the focus 11., passes the separating-piece q,fixed to the rod 0. This piece consists ofan incombustible non-c011- ducting substance, such as kaolin, porcelain, or the like. The voltaic are now passes in a curve around the bottom of the plate q, and since this plate is of a constant thickness the arc is likewise always of the same length. The thickness of the plate q is chosen in accordance with the tension employed, and thus arcs Varying in length may be obtained.

The current may pass through the magnets and the carbons in series.

The rod 0 is connected to the armature t of the magnets 21.. WVeights w, capable of adjustment upon the arms '2), connected with the armature t, tend tolift the armature t, and consequently also the plate q. When the current through the magnets is-switched off, the plate is drawn away from between the two carbons and the latter come into contact. When the current is switchedonagain, the armature t is pulled downward, the carbons are forced apart by the plate q, and the arc is struck.

The whole lamp is suspended from the bolt 5, which passes through the face-plates 7c.

If the lamp is not to be used as a suspended lamp, but in any other position-for instance,

The

in connection with a reflectorsprings must obtained, seeing that the insulating-plate is raised to a white heat and emits an intense light, similar to lime-light.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In an arc-lamp, the combination, with the frame, of a pair of carbon-holders arranged inclining toward each other, a pair of links connecting each carbon-holder with the lamp=frame, a separating-plate of insulating material and means for holding the same between the ends of the carbons, substantially as described.

2. In an arc-lamp, the combination with the lamp-frame of the carbon-holders, a pair 

